Thanks I need all the help I can get, I have two 2002 ext cabs with the 5.3 and was leaning in that direction, where do you find what all the LS, L1 and so forth mean as far year and engine size and thanks again

Yes and thank you very much, now to find out what they came out in to see if I can find a wrecked unit to salvage the parts I will need looks like this will be the cheapest way to go, would the motor and trans from a van change the same as a 1500 truck or would the truck work better for all the parts I will need, it has been many years since I got into some thing like this and I have ether forgotten or never knew much

I bought a book (How to Swap GM LS-Series Engines into almost anything) to answer the very questions you're asking. The book was written by Jefferson Bryant, and published by Car Tech Inc. (SA 156) www.cartechbooks.com. It's a soft cover book that I found at Barnes&Noble. I thought you might want to check it out!